Thirteen hundred medical professionals, all of which have been trained to treat drug dependency, attended the annual convention

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问题 Thirteen hundred medical professionals, all of which have been trained to treat drug dependency, attended the annual convention sponsored by a society

选项 A、Thirteen hundred
B、all of which
C、attended
D、sponsored

答案B

解析 句子大意为:有1300个医学专家参加了一个协会发起的年度大会,他们全部经过医治药物依赖症的训练。本题考查关系代词的用法。在引导非限制性定语从句时,如果指代对象为人,则应使用whom。故all of which应改为all of whom。所以,正确答案是B。
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